Doctor Strange (played by Benedict Cumberbatch) will not appear in Captain America: Civil War (at least that we know of; there might be a post-credits scene), but the Russo brothers showed us which team the Sorcerer Supreme would be joining: Team Captain America!
Marvel's "Captain America: Civil War" finds Steve Rogers leading the newly formed team of Avengers in their continued efforts to safeguard humanity. But after another incident involving the Avengers results in collateral damage, political pressure mounts to install a system of accountability, headed by a governing body to oversee and direct the team. The new status quo fractures the Avengers, resulting in two camps—one led by Steve Rogers and his desire for the Avengers to remain free to defend humanity without government interference, and the other following Tony Stark's surprising decision to support government oversight and accountability."
Captain America: Civil War will be released in theaters on May 6. Doctor Strange will is set to release on Nov. 4.